From 91e188fbb70c20b939c221a95123934358d1c6c5 Mon Sep 17 00:00:00 2001
From: Fabian Kirchner <fabian.kirchner@hereon.de>
Date: Wed, 29 Nov 2023 14:14:33 +0100
Subject: feat: collect issues referencing issue

---
 anissue.cabal     |  1 +
 app/Issue.hs      |  3 +++
 app/Issue/Meta.hs | 27 +++++++++++++++++++++++++++
 app/Main.hs       |  2 ++
 4 files changed, 33 insertions(+)
 create mode 100644 app/Issue/Meta.hs

diff --git a/anissue.cabal b/anissue.cabal
index 170f0ae..5352c7c 100644
--- a/anissue.cabal
+++ b/anissue.cabal
@@ -80,6 +80,7 @@ executable anissue
       Issue
       Issue.Filter
       Issue.Group
+      Issue.Meta
       Issue.Provenance
       Issue.Sort
       Issue.Tag
diff --git a/app/Issue.hs b/app/Issue.hs
index f8bf0ec..f0940f2 100644
--- a/app/Issue.hs
+++ b/app/Issue.hs
@@ -56,6 +56,9 @@ internalTags (Issue {..}) =
 instance HasField "internalTags" Issue [Tag] where
   getField issue = internalTags issue
 
+instance HasField "id" Issue (Maybe String) where
+  getField issue = id issue
+
 toSpinalCase :: T.Text -> T.Text
 toSpinalCase = T.replace " " "-" . T.filter keep . T.toLower
   where
diff --git a/app/Issue/Meta.hs b/app/Issue/Meta.hs
new file mode 100644
index 0000000..d9851ec
--- /dev/null
+++ b/app/Issue/Meta.hs
@@ -0,0 +1,27 @@
+module Issue.Meta
+  ( Meta (..),
+    getMeta,
+  )
+where
+
+import Data.Text qualified as T
+import Issue (Issue (..))
+import Issue.Tag (Tag, tagValue)
+
+data Meta = Meta
+  { referencedBy :: [(Issue, Tag)]
+  }
+  deriving (Show)
+
+getMeta :: [Issue] -> Issue -> Meta
+getMeta issues issue =
+  Meta
+    { referencedBy =
+        concatMap
+          ( \issueOther ->
+              let tagsRelevant =
+                    filter (\tag -> tagValue tag == fmap T.pack issue.id) issueOther.tags
+               in map (\tag -> (issue, tag)) tagsRelevant
+          )
+          issues
+    }
diff --git a/app/Main.hs b/app/Main.hs
index d6f653c..a16ee7e 100644
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -403,6 +403,7 @@ import Issue qualified as I
 import Issue.Filter (Filter, applyFilters)
 import Issue.Filter qualified as I
 import Issue.Group qualified as I
+import Issue.Meta qualified as I
 import Issue.Provenance qualified as I
 import Issue.Sort (Sort, applySorts)
 import Issue.Sort qualified as I
@@ -652,6 +653,7 @@ main = do
         case find ((==) (Just id) . I.id) issues of
           Nothing -> die (printf "no issue with id `%s'\n" id)
           Just issue -> pure issue
+      let meta = I.getMeta issues issue
       let s =
             (LT.fromStrict (T.intercalate " " issue.markers) <> " " <> LT.fromStrict issue.title)
               <> maybe "" (("\n\n" <>) . LT.fromStrict) issue.description
-- 
cgit v1.2.3